Telescopic belt conveyors are multifunctional machines which are used widely in loading and unloading non-palletized goods such like parcels, cartons, packages, bags etc. between logistics center, ports, docks, stations, airports, warehouses and vehicles, vans, trucks, articulated lorries, trains serially. Based on the smart design of telescopic belt conveyor, the loading and unloading operations can be very easily and advantageously performed by extension and retraction structure which can stop, move forward and reverse at any length position.